| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens system capable of simultaneously guaranteeing low chromatic aberration and high definition. <P>SOLUTION: A lens system includes, in order from an object side to an image side, a first lens with negative refraction power, a second lens with positive refraction power, a third lens with negative refraction power, a fourth lens with positive refraction power, and a fifth lens with negative or positive refraction power, in which all of the first to fifth lenses are aspheric lenses, satisfying the following condition (1): 0.9<F2/F<1.4, where D represents an effective focal length of the second lens and F represents an effective focal length of the lens system. <P>COPYRIGHT: (C)2013,JPO&INPIT |
